python 调用 C 动态库

#ifndef POINT_H                    
#define POINT_H                    
                                   
struct point                       
{                                  
    int x;                         
    int y;                         
};                                 
                                   
void point_print(struct point * p);
                                   
#endif /* POINT_H */  

#include <stdio.h>                         
#include "point.h"                         
                                           
void point_print(struct point * p)         
{                                          
    printf("x = %d, y = %d\n", p->x, p->y);
}                                          

gcc -fPIC -shared point.c -o libpoint.so

#! /usr/bin/python                
                                  
from ctypes import *              
                                  
class point(Structure):           
    _fields_ = [                  
        ("x", c_int),             
        ("y", c_int)              
    ]                             
                                  
ptr = point(10, 20)               
libpoint = CDLL("./libpoint.so")  
libpoint.point_print(byref(ptr))  
libpoint.point_print(pointer(ptr))

$ ./point.py  
x = 10, y = 20
x = 10, y = 20
$